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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef A_HIERARCHICAL_STATE_MACHINE_H_
#define A_HIERARCHICAL_STATE_MACHINE_H_
#include <media/stagefright/foundation/AHandler.h>
namespace android {
struct AState : public RefBase {
AState(const sp<AState> &parentState = NULL);
sp<AState> parentState();
protected:
virtual ~AState();
virtual void stateEntered();
virtual void stateExited();
virtual bool onMessageReceived(const sp<AMessage> &msg) = 0;
private:
friend struct AHierarchicalStateMachine;
sp<AState> mParentState;
DISALLOW_EVIL_CONSTRUCTORS(AState);
};
struct AHierarchicalStateMachine {
AHierarchicalStateMachine();
protected:
virtual ~AHierarchicalStateMachine();
virtual void handleMessage(const sp<AMessage> &msg);
// Only to be called in response to a message.
void changeState(const sp<AState> &state);
private:
sp<AState> mState;
DISALLOW_EVIL_CONSTRUCTORS(AHierarchicalStateMachine);
};
} // namespace android
#endif // A_HIERARCHICAL_STATE_MACHINE_H_
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